I have tried to find this info on line but am not coming up with anything. I am at an increased risk for an ectopic. Dh and I are TTC and I am just wondering how many DPO an US can be done to see if/where the baby would be?

I also did IVF and was therefore at increased risk for ectopic pregnancy. My RE's policy was to check the fallopian tubes at the 6w ultrasound (approx. 28 days after transfer, transfer being roughly equivalent to ovulation).

scsigrl, I believe it relates to the size of the embryo and their ability to detect it with ultrasound. By 5 weeks (three weeks after ovulation) they can usually detect a sac and a fetal pole in the uterus, so a check then might work for you to at least know if there is a uterine pregnancy (although there could be a fallopian pregnancy that they missed because it was still quite small, as I understand it -- but for a "normal" pregnancy, i.e. not IVF, the chances of a uterine pregnancy and a fallopian pregnancy would be quite tiny, I think). They also wait until 6 weeks because if there is a uterine pregnancy they can usually see a heartbeat at that time.

If you figure that most people get a positive pregnancy test when their period is due (4 weeks), it's just a week or two afterward. But yes, those two weeks are very, very hard to wait.